RocKv Mountain Ramdlks. 



159 



Placerville in the San Miguel range. The plains east abound 

 with the prickly poppy (Argemone intermedia) which occupies 

 in places many acres and is a frequent plant in the Salt Lake basin 

 in Utah. 



The genus Oenothera is abundantly represented on the plains. 

 The large-rooted morning glory {I pomoea leptophylla) occupies 

 open places about Denver and eastward to Nebraska, while 

 the ungrazed areas along the railway are lined with the white- 



Fig. 4. Dwarf Engelmann Spruce {Picea Engelmannii) at an altitude of 12S00 feet in 

 the Uintah Moimtains, Utah. 



flowered Oenothera pinnatifida. The white-flowered Oenothera 

 coronopifolia is conspicuous on the plains and in the foothills. 

 Oenothera alhicaulis is common not only in the Colorado Rockies 

 but also in the Wasatch mountains and at lower altitudes in the 

 Uintah Mountains. The Oenothera caespitosa is common every- 

 where on dry hills; the large white or rose-colored flowers are con- 

 spicuous, and other acaulescent species also occur in the region 

 on shaly rock. The Oenothera missouriensis with large yellow 

 flowers is more common east of the divide on the plains adjacent 



